GHS (Graded hammer Standard): Well suited for the beginner pianist and delivers the graded, weighted touch piano teachers recommend for building proper technique for playing acoustic pianos.

GH3:Like GH / GHE, but GH3 also swings back faster, like high quality piano keys. GH3 allows the player to feel the weight of the key when depressed a second time, even when the player has not completely released the key after the first push of the key.

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